D band (waveguide)

The D band is a frequency band designation for radio frequencies typically used in waveguide systems. It encompasses frequencies in the range of approximately 110 GHz to 170 GHz. This places it within the extremely high frequency (EHF) portion of the electromagnetic spectrum, also known as the millimeter wave band.

Due to the high frequencies involved, D band signals are typically propagated through waveguides rather than free space propagation, as waveguides provide a controlled and efficient transmission medium, mitigating losses associated with atmospheric absorption and free-space path loss that become significant at these frequencies.

Applications for D band waveguides include high-resolution radar systems, high-capacity communication links, scientific research, and imaging technologies. The relatively short wavelengths allow for compact antenna designs and fine resolution in imaging and sensing applications. The D band is used in both civilian and military applications, often in scenarios where high bandwidth and precise targeting are required.

The choice of D band for a specific application is typically driven by a combination of factors, including atmospheric propagation characteristics, available technology, regulatory considerations, and desired performance characteristics.